In addition to writing and recording a few solo albums, Amper's other dubbing roles (often for Disney projects) include Billy Ray Cyrus in the Hannah Montana franchise, Taye Diggs in Chicago, Patrick Warburton in Underdog (and as Kronk in The Emperor's New Groove), George Sanderson in Monsters Inc., and the singing voices of Dr. Facilier in The Princess and the Frog, Guy Pearce in Bedtime Stories, and Brom Bones in The Adventures of Ichabod and Mr. Toad.

In 2015, Amper was interviewed for Disney Magic Moments to comment on Animal and on other Disney characters making the cut on the rankings show.